From 8876e964cf26a090d11fd855642c95bc02a17c7f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 20 Oct 2014 15:05:41 +1300
Subject: Support PT502 binary messages (fix #825)

---
 src/org/traccar/protocol/Pt502FrameDecoder.java | 62 +++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/org/traccar/protocol/Pt502FrameDecoder.java

(limited to 'src/org/traccar/protocol/Pt502FrameDecoder.java')

diff --git a/src/org/traccar/protocol/Pt502FrameDecoder.java b/src/org/traccar/protocol/Pt502FrameDecoder.java
new file mode 100644
index 000000000..58409ecbf
--- /dev/null
+++ b/src/org/traccar/protocol/Pt502FrameDecoder.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2014 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+import org.traccar.helper.ChannelBufferTools;
+
+public class Pt502FrameDecoder extends FrameDecoder {
+    
+    private static final int BINARY_HEADER = 5;
+    
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+
+        if (buf.readableBytes() < BINARY_HEADER) {
+            return null;
+        }
+
+        if (buf.getUnsignedByte(buf.readerIndex()) == 0xbf && buf.getUnsignedByte(buf.readerIndex() + 1) == 0xfb) {
+            
+            int length = buf.getShort(buf.readerIndex() + 3);
+            if (buf.readableBytes() >= length) {
+                buf.skipBytes(BINARY_HEADER);
+                ChannelBuffer result = buf.readBytes(length - BINARY_HEADER - 2);
+                buf.skipBytes(2);
+                return result;
+            }
+            
+        } else {
+            
+            Integer index = ChannelBufferTools.find(buf, 0, buf.readableBytes(), "\n");
+            if (index != null) {
+                ChannelBuffer result = buf.readBytes(index - 1);
+                buf.skipBytes(2);
+                return result;
+            }
+            
+        }
+
+        return null;
+    }
+
+}
-- 
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